The main goal of our paper is to study the relation between the models in [1]} and models with non-linear realization of supersymmetry developed in [2]}, [3]}, [4]}. We will find that there is a discontinuity, a gap between the models with linear realization of supersymmetry proposed in [1]}, and models with the non-linear supersymmetry. Therefore, the vacuum instability found in [1]} demonstrates the problem of their specific model, but does not imply the existence of a similar instability in theories with non-linear realization of supersymmetry.
